.div1 {
  width: 0px;
  height: 0px;
  border-width: 50px;
  display: inline-block;
  border-color: red transparent transparent transparent;
  border-style: solid; }

.div2 {
  width: 0px;
  height: 0px;
  border-width: 100px;
  display: inline-block;
  border-color: transparent blue transparent transparent;
  border-style: solid; }

.div3 {
  width: 0px;
  height: 0px;
  border-width: 150px;
  display: inline-block;
  border-color: transparent transparent black transparent;
  border-style: solid; }

.div4 {
  width: 0px;
  height: 0px;
  border-width: 200px;
  display: inline-block;
  border-color: transparent transparent transparent yellow;
  border-style: solid; }
